OP, if you’re worried about buying a knife or two more than you need or will ever likely use, which is what I think you’re asking, there might be a few people here who can put your mind at ease. Most of us could probably get by with two or three knives. I got by with one SAK for the better part of 40 years. Most of us here have a few more than that (some have a LOT more), many of us have knives that will never likely be used. Look around, find a one-hand opener that you really like, then go for it. As someone said, if you’ve only had slipjoints, some folders might need a little practice to get comfortable with. A lot of nights I grab a couple or three knives and just flip them open and closed while sitting here in front of the boob tube. Like right now. Drives the wife nuts. Eventually you get comfortable enough that it becomes second nature. Then, if you hang around here long enough, you start seeing knives that you might like even more, either to use, or just to look at and fidget with.
Start with something inexpensive - there are tons of options for under $50 that are good quality and decent users, just to get an idea of what you do and don’t like without blowing a pile of cash. If you see something you like but aren’t sure about pulling the trigger, just ask the folks in here for their opinions, and read all the owner reviews you can find to get an idea if what you’re looking at is junk or not.